Leyland Car Owners -

Hi all!

: The subject of coolants is a very contentious one.
: The colouring of the coolant has no bearing on it's quality.
: It is purely colouring, to aid in it's identification.
: The Toyota coolant is an excellent coolant & it is made in Australia by ICI industries.
: They also make the coolant for GMH, Mitsubishi, Repco, Valvoline etc, etc in green as well.
: There are two basic types of coolant, IE Ethylene Glycol based as in the previously mentioned examples, or the newer organic type corrosion inhibitors.
: Mixing of coolants is a big no no, so complete flushing is important. Tectalloy make the biggest range of coolants from pre mixed to concentrates.
: ICI also supply their ethelene glycol range,(Tectalloy, also have the organic type coolants). What is best is hard to say. I personally lean towards the ethelene glycol type (although it is not enviromentally friendly, hence the newer organic type ) but I have had plenty of engines apart over my 25 years & the alloy components of the engines that have this type of coolant are always in good shape.
: Also, in Europe, where every car has to have anti freeze, (which is what the ethelene glycol is used for), the problems of corrosion, cavitation, electrolysis & electro-chemical degradation, don't exist.

: Water quality is also important.
: I don't know if you remember the troubles VN V6 Commodores had with welch plugs rotting out under warranty, well this was traced to poor quality water used in the initial fill in South Australia. Vehicles assembled in QLD did not suffer the problem.
: Incidentally, you don't see leaking welch plugs on VN's any more so I suppose they must have been right(we hardly see VN's anyway!!)

: The Leyland SQ-36 coolant also had a large percentage of ethelene glycol.
: When you are shopping, read the containers, anything with over 900ml/litre IE 90% ethelene glycol is ok.
: These are generally mixed in the ratio of 50/50 or 33% depending on the anti freeze requirement.
: Don't be tempted to use it at higher ratio's than 50/50 as it will "reduce" the ability of the coolant to absorb heat, which is really what it is in there for!
: I hope this helps!
: Cheers,
: Jason

Leyland P76 Owners 2005

Technical Information

Coolants

By Jason - June 2005